package org.fujene.diskblock;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import org.fujene.memoryblock.MemoryBlock;
import org.fujene.memoryblock.PureContentBlock;
import org.fujene.structure.Constants;
import org.fujene.toolbox.ByteConverter;

public class PureContentDiskBlock extends DiskBlock{
	public PureContentDiskBlock(File fileDesc){
		super(fileDesc);
	}

	public PureContentDiskBlock(PureContentBlock memBlock, String dir){
		super(memBlock, dir);
	}

	public PureContentDiskBlock(int ID, File desc, int defaultBodySize, int defaultOptionSize)
			throws Exception{
		super(ID, desc, Constants.MEMORY_TYPE_PURECONTENT, defaultBodySize, defaultOptionSize);
	}

	public String getContent(int ptr) throws IOException{
		if(ptr >= bodySize)
			return null;
		FileInputStream stream = null;
		byte[] val = new byte[STRLEN];
		int strlen;

		try{
			stream = new FileInputStream(fileDesc);
			switch (version){
			case Constants.FINALVER:
				stream.skip((4 * HEADERLEN) + (4 * optionSize) + ptr);
				stream.read(val);
				strlen = ByteConverter.byteToInt(val);

				val = new byte[strlen];
				stream.read(val);
				break;

			default:
				break;
			}
		}finally{
			stream.close();
		}

		return new String(val, "UTF-8");
	}

	public int getSupplementIndex(){
		try{
			return this.getOption(0);
		}catch (Exception e){
			return -1;
		}
	}

	@Override
	public void readToMemory(MemoryBlock memBlock){
		if(memBlock instanceof PureContentBlock){
			try{
				memBlock.setOption(0, this.getOption(0));
				memBlock.setBody(this.getBody(0, this.bodySize), 0);
				memBlock.setBodyVacancy(this.bodyVacancy);
			}catch (Exception e){}
		}
	}

	@Override
	public byte[] getData(){
		ByteArrayOutputStream stream = new ByteArrayOutputStream(this.bodySize + 4);

		try{
			stream.write(ByteConverter.intToByte(this.getOption(0), 4));
			stream.write(this.getBody(0, this.bodySize));
		}catch (IOException e){}

		return stream.toByteArray();
	}
}
